http://www.bized.ac.uk/cgi-bin/chron/chron.pl?id=2506
"Since the attacks on the World Trade Centre in New York in 2001, billions have been spent on tracing potential terrorist networks around the globe. More is now known of the financing of such terrorist activities and it was thought that freezing the assets of suspected terrorist groups and monitoring the financial transactions of individual suspects might help the authorities prevent such attacks reoccurring.
However, a BBC World Service investigation (http://news.bbc.co.uk/2/hi/uk_news/4576346.stm )suggests that this might not be the catch-all that investigating teams might have hoped for. The investigation suggests that the cost of staging the attacks on the United States in 2001 was around $500,000. Theoretically, such sums of money should provide investigators with some leads, despite the web of complex transactions that can be used to disguise what is really going on. "
